tonight, president obama and rim mitt romney were just 10 miles apart in columbus, ohio. >> here's the thing, ohio. we know what change looks like. and what he's tell -- selling ain't it. >> reporter: the president has jay-z. [singing rap] >> reporter: and bruce springsteen. >> i am going to be flying with bruce springsteen on the last camday i will ever campaign. >> reporter: the race has been deadlocked for weeks, but today, the president open up a slim lead in the abc news tracking poll. ohio is the most important battleground state. the president has the edge according to poll, but romney's not going down without a fight. with the race going down to the wire, each campaign is expressing confidence in their ground games. the president wrapped up his campaigning with an emotional event in des moines, iowa, a state with a lot of sentimental value for the president. nearly five years ago, his win launched his journ tote white house. but tomorrow, he will be here in his home city of chicago, waiting for election results, just like millions of americans. live from chicago, karen travers.